Which fuse block terminal for elec fan? - Team Camaro Tech
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post #1 of 7 (permalink) Old Mar 28th, 10, 07:04 PM Thread Starter
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Brian
 
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Which fuse block terminal for elec fan?

Hey fellas- This should be an easy one. My fuse block for my 69 has the following terminals available:

LPS (Free)
IGN (occupied)
ACC (occupied)
BAT (Free)

Which of these can I connect my IGN controlled wire for the fan? Do I double tap off of the IGN spot or would one of the open ones do?

Thanks!
Brian

1969 Camaro 383
2.02/1.63 & 234/244 Vortec
TH350 / 12 bolt 3.73
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post #2 of 7 (permalink) Old Mar 28th, 10, 09:16 PM
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Re: Which fuse block terminal for elec fan?

Are you wanting to get the fans main power from the fuse block ? If it's a low current fan, then the fuse block "may" be able to handle the added current draw but I would probably wire the main power for the fan to the battery through a relay and then have this relay tied into the fuse block and/or through some kind of temperature sensor or activation switch.
A gripe I have with fans coming on with the engine not running is they are cooling the water in the radiator but it's not circulating and that's why I would wire it up to an ignition circuit. A blowing fan on a stopped engine also pushes air by the motor to somewhat cool it but it's not the ideal way to do it. Having the fans operational when the engine is running also keeps the fan from coming on with the key in the off position and should you decide to work on the motor not have to worry about the fan kicking on when your fingers could be in the fan area.
Chances are the terminals you see in the fuse block are protected by neighboring fuses and on my car years ago I had all kinds of splitters on my BAT, IGN, and ACC terminals powering up the coils in relays. The relay coils drew about 1A or so of current and didn't overload the original fuse block.

Jim

1974 Spirit Of America Nova (being restored), 1973 Nova Custom, 1968 Chevy II (Garage Find 2012)

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post #3 of 7 (permalink) Old Mar 28th, 10, 10:29 PM Thread Starter
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Re: Which fuse block terminal for elec fan?

Right. I am intending for the fan to only run when the engine is running.

1969 Camaro 383
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post #4 of 7 (permalink) Old Mar 29th, 10, 01:17 PM
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Re: Which fuse block terminal for elec fan?

A relay should be used for most electric fans, dont wire directly to the fuse block

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post #5 of 7 (permalink) Old Mar 29th, 10, 01:20 PM
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Re: Which fuse block terminal for elec fan?

Absolutely use a relay!!!!
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post #6 of 7 (permalink) Old Mar 29th, 10, 01:24 PM
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Greg
 
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Re: Which fuse block terminal for elec fan?

Relay and run the power to the horn relay buss bar for best performance, not the battery.

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post #7 of 7 (permalink) Old Mar 29th, 10, 07:24 PM
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Jim
 
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Re: Which fuse block terminal for elec fan?

Quote:
Originally Posted by PA Camaro Guy View Post
Right. I am intending for the fan to only run when the engine is running.
Ok, next step, are you wanting, or do you want the fan on only when the ignition is on and the motor is cold or only when the ignition is on and the engine is above a certain temperature ?. You can certainly wire to where it's on and the engine is cold and it will not hurt anything. Some people wire it this way while others have the trigger wire for the relay going through an electronic thermostat. More things can equate into possibly more problems but it's really up to you.

Whatever you do, size the wire properly, fuse it properly, make good solid connections, and use quality parts.

Jim

1974 Spirit Of America Nova (being restored), 1973 Nova Custom, 1968 Chevy II (Garage Find 2012)

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